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Herein, we describe a highly efficient and eco-friendly protocol for the synthesis of benzimidazoles, benzothiazoles, and quinoxalines using VOSO4 as a catalyst in ethanol. Use of nontoxic and recyclable catalyst, clean reaction profile, high yields, scalability, and broad substrate scope are the important practical features of the present protocol.
A metal-free synthesis of 2-arylbenzothiazoles was achieved using phenyliodonium diacetate (PIDA) from benzothiazoles and styrenes or β-nitrostyrenes. This transformation tolerates various functional groups such as methoxy, hydroxy, fluoro, chloro, and nitro groups.
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